MHAO
| Acronym | Definition |
|---|---|
| MHAO | Manufactured Housing Association of Oklahoma |
| MHAO | Mohamed Hareb Al Otaiba (business group; United Arab Emirates) |
| MHAO | Minor Hockey Alliance of Ontario (Stratford, Ontario, Canada) |
| MHAO | Morgan Horse Association of Oregon |
| MHAO | Mental Health Association of Oregon (aka Mental Health America of Oregon) |
| MHAO | Mental Health America of Oregon (aka Mental Health Association of Oregon) |